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A Black Hole is a cosmic body that is so massive that it warps space-time around it. Even light, the fastest thing in the universe cannot escape from it. The ordinary laws of physics do not work beyond the event horizon of a black hole.Giant black holes are formed in the centers of galaxies and can have billions of sun masses. Our own Milky Way has a giant black hole in the centre!

Gravitational Wave Astronomy is a completely new kind of astronomy. The first detection of a gravitational wave on 14 September 2015 has opened a new window on the Universe, a new way of perceiving our cosmos. Gravitational waves are like a new sense. If existing astronomy is like seeing, gravitational wave astronomy is like hearing. Gravitational wave detectors are extremely sensitive "laser ears" and can "listen" to the ends of the universe and into places normal astronomy cannot see.

LISA Pathfinder will pave the way for the eLISA mission by testing in space the ideas and technology for gravitational wave detection. LISA Pathfinder will place two test masses in a nearly perfect gravitational free-fall. It will control and measure their relative motion with unprecedented accuracy. To do this LPF must be the quietest place in the solar system!

A series of lectures given at the Kerr Conference, hosted by the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) to commemorate the 50th aniversary of the discovery of the Kerr Metric.

Speakers included Roy Kerr, the discoverer of the Kerr Metric, and Reinhard Genzel.